BIOL 2107 Lecture Notes - Lecture 3: Hypercholesterolemia, Zygosity, Consanguinity
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Dihybrid: 2 sets of genes are looked at (e. g. pea colour (yy) and pea shape (rr)) Yes, they do; therefore, there are 16 different possibilities and the ratio is 9:3:3:1. For each trait however it is still 3:1 ratio (yellow: green and round: wrinkled) During the formation of gamete, different pairs of alleles segregate independently of each other. Y is just as likely to join with r and with r. Yr, yr, yr, yr = possible allele combinations in each gamete (1/4) Can analyze genes separately and then apply probability laws multiple genotypes to get phenotype (see figure 2. 17 on slide 20) branched line diagrams. Once again to determine genotype for unknown dominant gene. Recap: mendel"s results and the punnett square reflect the rules of probability (sum and product rule) Mendel"s laws can be used to predict offspring for other crosses.
